Review of two different USB mobile power banks - white 4-cell with 3-digit 7-segment LED display and black 6-cell with 5 LED display. Both have 2x USB sockets, a 1A socket and a 2A socket. Both have a 4mm multi voltage output jack. The white unit can provide between 5v and 13v in steps of 0.5v and the black unit supplies 3.7v, 5v, 9v and 12v.
http://www.fasttech.com/reviews/1341401/2949
http://r.ebay.com/SAdtvZ
http://r.ebay.com/sALvJG
http://www.fasttech.com/reviews/1341401/2949
http://r.ebay.com/SAdtvZ
http://r.ebay.com/sALvJG
whenever i see someone has bought ultrafire batteries i automatically assume that person is a fool and no point watching the rest of the video
What I find a bit comical with the ultrafire ones, their capacity is more like 600mA, so if you had a 6 cell bank full of them, it would only be the equivalent of a mere single Panasonic 18650 cell.
dp means down power … 🙂
aliexpress link?
I have been using one of these to charge 18650's for testing..mine does 8 at a time and gives a % of charge.. I bought it to use as a power bank but find it works really well as a charger and consistently ends the charge at 4.2v.
Hi Julien ,I have the same kind of 4 cell chager , the problemis after fixing it the power shows 75% charge n not 100% ,but when i use it to charge my cell phone it,s not chargeing my cell phone , what could be the problem , you advice please
It would have been nice if you had measured the actual output voltage, which may be above 3.7V at full battery charge, or below it not only due to discharge state but also the forward voltage drop through the diode. Except for that being potentially damaging to discharge too low if that doesn't have discharge protection, there seems to be a usefulness in it if the range of voltage directly powers an LED rather than boost up to 5V then buck or linear loss to get down to LED Vf again. On the other hand that is a fiddly thing to do, when it could have had a regulated LED driver and ~ 3W LED (running closer to 1.5W due to heatsink area limitations in such a confined space), then it would have made a nice long running light without being terribly dim.
These power banks doesn't have reverse polarity protection. I have burn three of these because of reversed polarity
Hey Julian/guys. Can anyone recommend any of these 18650 power banks which can rapid USB charge much the same way a phone can? The charging type which slowly draws heavier until it finds the supplies max current and sits on that (my Nexus 5X does this).
I do have a single charge/small power bank but even with a high current supply it will only draw the safe for all 0.5A.
Cheers guys!
Hi,
i dont know, what is wrong, because if i do on, set 9.0v and after 20s it go to off. With or w/o load, it is same 🙁
Can The Output of TP4056 be directly attached against the ( + & – ) of a Mobile Phone Battery Connector in order to find out the semi short of short component's by getting hot themselves and thus removing or lifting that particular component would help me to solve the semi or full short case ?
Your co-operation and thought shall be highly appreciated ?
arent you supposed to use all of the same batteries and never take them out since those power banks dont have balanced charging?… it chargers all of the batteries with one chip reading the voltage of them all at once instead of having a balanced charger that charges every cell individually. Always use all of the same batteries in those chargers, preferably new, and discharge them all as a group (dont take one out and later return it in) OR use batteries that you dont care if they'll blow up or vent and do whatever you want…